Ball chair



FIG. 1 is a perspective view of a first preferred embodiment of the present design.

FIG. 2 is a front view of the first preferred embodiment of the present design.

FIG. 3 is a rear view of the first preferred embodiment of the present design.

FIG. 4 is a left view of the first preferred embodiment of the present design.

FIG. 5 is a right view of the first preferred embodiment of the present design.

FIG. 6 is a top view of the first preferred embodiment of the present design.

FIG. 7 is a bottom view of the first preferred embodiment of the present design; and,

FIG. 8 is another perspective view of the first preferred embodiment of the present design. 

CLAIM The ornamental design for a ball chair, as shown and described. 